Extruding machine



EXTRUDING MACHINE Filed Dec. 22, 19:51

ATTORNEYS Patented June 26, 1934 I UNITED STATES PATENT OFFCE EXTRUDINGMACHINE Thomas H. Williams, Cuyahoga Falls, Ohio, as-

signor to National Rubber Machinery Company, Akron, Ohio, a corporationof Ohio Application December 22, 1931, Serial No. 582,531

s Claims. (o1. 14e- 174) This invention relates to extruding machines isprovided interiorly of the screw and the walland particularly toextruding machines of the thickness of the screw is maintainedsubstantially strainer type such as is employed for the refining uniformthroughout its length. The outer end of of rubber. the screw is closedby the screw trunnion 16 which Heretofore the production of suchmachinery may have an enlarged threaded end portion 17 60 has beenlimited due to the fact that the faster threaded into the end of thescrew. the stock is worked the more heat by friction The most eiectivecirculation of a temperature is developed and excess heat scorches thestock, CODIOlllg medium through the SCISW may be bspoiling it for itsintended uses. tained by mounting a pipe 18 within the bore 19 to Thegeneral purpose of the invention is to proof the screw, connecting saidpipe onto a hollow, 65 vide an extruding machine or rei-incr for rubberconical member 20 within the ared end portion or like thermoplasticmaterials constructed in of the said bore and arranging a helical rib 2lsuch manner that the temperature of the stock about the conical memberpreferably integral therein may be so controlled that the machine withthe wall of the screw whereby water or jig may be operated at greatlyincreased speeds withother temperature controlling fluid may be cir- 70out scorching and thus spoiling the stock. culated through the pipe 18and conical member The foregoing and other purposes of the in- 20 to theend of the screw and then helically vention are attained in the strainermachine ilin the Space between the convolutions 21 belustrated in theaccompanying drawing and detween the conical member and the wall of the,2,9 scribed below. Itis to be understood that the inscrew back throughthe screw about the pipe 18 75 vention is not limited to the specificform therein the bOlB 19- ThllS ll COODg the SUOCk the 0f Shown anddescyibedcoldest water is supplied at the outer end of the Of theaccompanying drawing, screw where the stock would tend to be hottest.

Figure 1 is a longitudinal, Vertical section The increase in the size ofthe screw in the through a portion of a strainer embodying the headCOUDlEd With the increased @001mg area 0f 80 invention; and the innersurface of its wall and preferably with Figure 2 is an enlargedSectional View 0f the the helical circulation of temperature controllinghead end of the strainer screw. medium adjacent said surface and counterto the Referring to the drawing, the numeral 10 desigdirection in whichthe stock is fed by the screw 3g nat-es a known form of extrudingmachine or results ina strainer, the production of which may 85 strainersuch as used in the refining of rubber be increased by speeding up themachine far in and having an inlet for the rubber at ll, a excess ofthat employed in prior practice while screw l2 for feeding and workingthe rubber maintaining the stock well below a temperature through themachine, ascreening head 13 through at which it would be scorched.

which the rubber is extruded and knives 14, 14 Mcdications of theinvention may be resorted 90 for cutting the issuing strands of rubber.Such to without departing from the spirit thereof or strainers includesuitable fluid circulating Systhe scope of the appended claims. tems asat 15 for controlling the temperature of What is claimed is:- the rubberstock in the body of the strainer or ex- 1. A strainer constructionincluding a strainer 4@ truding machine whereby it is maintained athead, means for feeding material into and ex- 95 proper workingconsistency without overheating. truding it through said strainer head,said means rlhe present invention relates to the construcincluding ascrew, a portion of said screw extendtion of the screw and thearrangement for cooling into said head, said portion of the screw beinging the same in the strainer head. As shown at enlarged in the head toreduce the volume of 12a the portion of the screw in the strainer headmaterial in the head, said portion of the screw 100` i is enlargedgradually outwardly or flared toward being hollow, and means forcirculating a uid its end. This prevents the accumulation of atemperature controlling medium through said large mass 0f SOCk Workingaround in the head hollow portion of the screw, said means includingwhich would tend to heat up due to the friction a pipe extended throughthe bore of the screw,

therein. The SCleW l2 S hOllOW fOI the DHIPOSS a hollow member in saidhollow portion defining 105 0f Circulating a @001mg medium therein, andt0 a conined space adjacent the inner surface of the this end is formedwith a bore 19 that is flared wall of said portion of the screw, saidpipe being within the enlarged end portion of the screw, connected tosaid member, and ahelical rib about complementally with relation to theexternal flare said member between it and the wall of said porof thelatter, whereby an increased cooling area tion for defining a helicalpassageway whereby a 110 fluid temperature controlling medium may becirculated in through said pipe into said portion of the screw throughsaid hollow member and out about said hollow member and back through thescrew about said pipe.

2. A strainer construction including a straine head, means for feedingmaterial into and extruding it through said strainer head, said meansincluding a screw, a portion of said screw extending into said head,said portion of the screw being enlarged in the head to reduce theVolume of material in the head, said portion of the screw being hollow,and means for circulating a fluid temperature controlling medium throughsaid hollow portion of the screw, said means including a pipe extendedthrough the bore of the screw, a hollow member in said hollow portiondefining a confined space adjacent the inner surface of the wall of saidportion of the screw, said pipe being connected to said member, wherebya fluid temperature controlling medium may be circulated in through saidpipe into said portion of the screw through said hollow member and outabout said hollow member and back through the screw about said pipe.

3. A strainer construction including a strainer head, means for feedingmaterial into and extruding it through said strainer head, said meansincluding a screw, a portion of said screw extending into said head,said portion of the screw being enlarged in the head to reduce thevolume of material in the head, said screw being hollow and of uniformwall thickness throughout its length, and means for circulating a uidtemperature controlling medium in a circuitous course through theenlarged head of said screw.

4. In a strainer, a strainer head, means for feeding material thereinand extruding the material therefrom comprising a screw extending intosaid head, the portion of the screw in the head being gradually flaredtoward the outer end of the head, said flared portion of the screw beingformed with a complementally flared bore, and means for circulating afluid temperature controlling medium through said bore in a circuitouscourse from the large end toward the small end thereof.

5. A strainer construction comprising a strainer head, means for feedingmaterial into and extruding it from said strainer head comprising ascrew, said screw having a portion thereof extending into said head andgradually flared toward its end, said screw being formed with an axialbore that is complementally flared within the flared end portion of thescrew, and means for circulating a fluid temperature controlling mediumthrough to the screw, said means including a pipe positioned in the boreof the screw and a concentric conical member positioned in the flaredportion of said bore and spaced from the wall thereof to define apassage for fluid delivered thereto through said pipe.

6. A combination as dened in claim 5 including a helical rib disposedabout the surface of the conical member.

7. A strainer comprising a screening head, a feed screw for forcingmaterial into and through said head, said screw having a graduallyflared end portion positioned in said head, said screw being formed withan axial bore that is flared complementally to its flared end portion,within the latter, and means for circulating a fluid temperaturecontrolling medium through the screw, said means including a pipe in thebore of the screw spaced from the wall thereof, and a hollow conicalmember mounted at its small end on the end of the pipe, said conicalmember being disposed within the flared portion of the bore and spacedfrom the wall and end thereof so that fluid from the pipe will pass outof its larger end, flow over its outer surface and pass out of the screwthrough the bore surrounding the pipe.

8. A strainer as defined in claim 'l including a helically arranged ribdefining a circuitous passage for uid around the exterior of the conicalmember.

9. A strainer as defined in Claim 7 in which the flared portion of thebore of the screw is formed with a helical rib that abuts the surface ofthe conical member to denne a circuitous passage for fluid thereabout.

THOMAS H. WILLIAMS.

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